Plot hole: Season 5, episode 20 (My Lunch). One of Dr. Cox' patients needs a heart valve transplanted. Heart valves don't have to be transplanted from another person. They can be replaced by a metal valve, or the surgeon can create a new valve from a different part of the patient's body. There was no reason to wait for a donor valve when they had other options available.

Carla: You can deny you like her all you want. But, I know for a fact, that every time you guys are done "playing racquetball" or "having a conversation" or whatever it is you crazy kids are calling it, you like nothing more than to just lie next to Jordan and watch her sleep. Dr. Cox: It would be impossible for me to lie next to Jordan, she sleeps hanging from a ramp in the ceiling, wrapped in a cocoon of her own wings.